Transistor vs mosfet7/23/2023 ![]() ![]() Both BJT and MOSFET has a wide range of applications.The switching speed limits of a BJT is higher than that of a MOSFET.A BJT is a current controlled device whereas a MOSFET is a voltage control device.BJTs are bipolar devices whereas MOSFETs are unipolar devices.BJT and MOSFET are semiconductor devices with a wide range of applications.MOSFETs are suitable for power supplies and high-frequency low voltage applications. Applications BJTs are much suitable for amplifiers, oscillators and switching of circuits with constant current flow. A MOSFET has a safe operating area similar to BJT but does not have a second breakdown limit. Second breakdown limit A BJT has a second breakdown limit. Power consumption Since BJT is a current controlled device, it consumes more power than voltage-controlled devices like MOSFET. MOSFETs have positive temperature coefficient and can be easily paralleled. Input Impedance Low High Output Impedance Low Medium Temperature coefficient and paralleling BJTs have negative temperature coefficient that limits their parallel operation. The maximum switching frequency is 300KHz. Switching speed The maximum switch speed of a bipolar junction transistor is close to 100KHz. Control method A BJT is a currect controlled device. Either electrons or holes acts as charge carrier. Terminals Base, emitter and collector Gate, source and drain Symbol Transistor type Bipolar transistor Unipolar transistor Charge carriers Both electrons and holes acts as charge carries in BJT. MOSFETs are categorized into enhancement MOSFET (p channel and n channel) and depletion MOSFET (p channel and n channel). Difference between BJT and MOSFET Properties Bipolar Junction Transistor (BJT) Metal Oxide Semiconductor Field Effect Transistors (MOSFET) Classification There are two types of bipolar junction transistors: NPN and PNP. An Enhancement MOSFET stay OFF under normal conditions and requires a Gate voltage to turn it ON whereas the depletion MOSFET stays ON under normal conditions and requires s Gate voltage to turn it OFF. Based on the operation principle it is classified into Enhancement MOSFET and depletion MOSFET. ![]()
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